A few people have asked me about the Diver's Slate - am I worried that without it I will forget the ideas that come to me in the shower? It's partly that yes - but mostly it's something else. It's more that my mind is rubbish at remembering things, so without somewhere to write the ideas down I have to play mental keepy-uppy trying not to drop them. The keepy-uppy effort blocks other ideas from following along and I think the ideas know that! But when they see the Diver's Slate they say to each other "it's ok, the way is clear, follow me". You have to encourage ideas - they can be quite timid creatures.
See also Family Writeboards.